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SubjectRe: [PATCH 2/4] [SCSI] ufshcd: UFS UTP Transfer requests handling
On Sun, Feb 5, 2012 at 6:21 PM, Namjae Jeon <linkinjeon@gmail.com> wrote:
> 2012/2/2 Vinayak Holikatti <vinholikatti@gmail.com>:
>> From: Santosh Yaraganavi <santoshsy@gmail.com>
>>
>> This patch adds support for Transfer request handling.
>>
>> ufshcd includes following implementations:
>>  - SCSI queuecommand
>>  - Compose UPIU(UFS Protocol information unit)
>>  - Issue commands to UFS host controller
>>  - Handle completed commands
>>
>> Signed-off-by: Santosh Yaraganavi <santoshsy@gmail.com>
>> Signed-off-by: Vinayak Holikatti <vinholikatti@gmail.com>
>> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
>> Reviewed-by: Saugata Das <saugata.das@linaro.org>
>> Reviewed-by: Vishak G <vishak.g@samsung.com>
>> Reviewed-by: Girish K S <girish.shivananjappa@linaro.org>
>> ---
>>  drivers/scsi/ufs/ufshcd.c |  447 +++++++++++++++++++++++++++++++++++++++++++++
>>  1 files changed, 447 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
>> index c82eeea..23d758b 100644
>> --- a/drivers/scsi/ufs/ufshcd.c
>> +++ b/drivers/scsi/ufs/ufshcd.c
>> @@ -62,6 +62,7 @@
>>  #include <scsi/scsi.h>
>>  #include <scsi/scsi_cmnd.h>
>>  #include <scsi/scsi_host.h>
>> +#include <scsi/scsi_tcq.h>
>>  #include <scsi/scsi_dbg.h>
>>
>>  #include "ufs.h"
>> @@ -81,6 +82,7 @@ enum {
>>        UFSHCD_MAX_CHANNEL      = 1,
>>        UFSHCD_MAX_ID           = 1,
>>        UFSHCD_MAX_LUNS         = 8,
>> +       UFSHCD_CMD_PER_LUN      = 16,
>>        UFSHCD_CAN_QUEUE        = 32,
>>        BYTES_128               = 128,
>>        BYTES_1024              = 1024
>> @@ -146,6 +148,7 @@ struct uic_command {
>>  * @host: Scsi_Host instance of the driver
>>  * @pdev: PCI device handle
>>  * @lrb: local reference block
>> + * @outstanding_reqs: Bits representing outstanding transfer requests
>>  * @capabilities: UFS Controller Capabilities
>>  * @nutrs: Transfer Request Queue depth supported by controller
>>  * @nutmrs: Task Management Queue depth supported by controller
>> @@ -184,6 +187,8 @@ struct ufs_hba {
>>
>>        struct ufshcd_lrb *lrb;
>>
>> +       u32 outstanding_reqs;
>> +
>>        u32 capabilities;
>>        int nutrs;
>>        int nutmrs;
>> @@ -204,12 +209,28 @@ struct ufs_hba {
>>  * @ucd_cmd_ptr: UCD address of the command
>>  * @ucd_rsp_ptr: Response UPIU address for this command
>>  * @ucd_prdt_ptr: PRDT address of the command
>> + * @cmd: pointer to scsi command
>> + * @sense_buffer: pointer sense buffer address of the scsi command
>> + * @sense_bufflen: Length of the sense buffer
>> + * @scsi_status: SCSI status of the command
>> + * @command_type: SCSI, UFS, Query.
>> + * @task_tag: Task tag of the command
>> + * @lun: LUN of the command
>>  */
>>  struct ufshcd_lrb {
>>        struct utp_transfer_req_desc *utr_descriptor_ptr;
>>        struct utp_upiu_cmd *ucd_cmd_ptr;
>>        struct utp_upiu_rsp *ucd_rsp_ptr;
>>        struct ufshcd_sg_entry *ucd_prdt_ptr;
>> +
>> +       struct scsi_cmnd *cmd;
>> +       u8 *sense_buffer;
>> +       unsigned int sense_bufflen;
>> +       int scsi_status;
>> +
>> +       int command_type;
>> +       int task_tag;
>> +       int lun;
>>  };
>>
>>  /**
>> @@ -236,6 +257,18 @@ static inline int ufshcd_is_device_present(u32 reg_hcs)
>>  }
>>
>>  /**
>> + * ufshcd_get_tr_ocs - Get the UTRD Overall Command Status
>> + * @lrb: pointer to local command reference block
>> + *
>> + * This function is used to get the OCS field from UTRD
>> + * Returns the OCS field in the UTRD
>> + */
>> +static inline int ufshcd_get_tr_ocs(struct ufshcd_lrb *lrbp)
>> +{
>> +       return lrbp->utr_descriptor_ptr->header.dword_2 & MASK_OCS;
>> +}
>> +
>> +/**
>>  * ufshcd_get_lists_status - Check UCRDY, UTRLRDY and UTMRLRDY
>>  * @reg: Register value of host controller status
>>  *
>> @@ -303,6 +336,36 @@ static inline void ufshcd_free_hba_memory(struct ufs_hba *hba)
>>  }
>>
>>  /**
>> + * ufshcd_is_valid_req_rsp - checks if controller TR response is valid
>> + * @ucd_rsp_ptr: pointer to response UPIU
>> + *
>> + * This function checks the response UPIU for valid transaction type in
>> + * response field
>> + * Returns 0 on success, non-zero on failure
>> + */
>> +static inline int
>> +ufshcd_is_valid_req_rsp(struct utp_upiu_rsp *ucd_rsp_ptr)
>> +{
>> +       return ((be32_to_cpu(ucd_rsp_ptr->header.dword_0) >> 24) ==
>> +                UPIU_TRANSACTION_RESPONSE) ? 0 :
>> +                                             (DID_ERROR << 16 |
>> +                                              COMMAND_COMPLETE << 8);
>> +}
>> +
>> +/**
>> + * ufshcd_get_rsp_upiu_result - Get the result from response UPIU
>> + * @ucd_rsp_ptr: pointer to response UPIU
>> + *
>> + * This function gets the response status and scsi_status from response UPIU
>> + * Returns the response result code.
>> + */
>> +static inline int
>> +ufshcd_get_rsp_upiu_result(struct utp_upiu_rsp *ucd_rsp_ptr)
>> +{
>> +       return be32_to_cpu(ucd_rsp_ptr->header.dword_1) & MASK_RSP_UPIU_RESULT;
>> +}
>> +
>> +/**
>>  * ufshcd_config_int_aggr - Configure interrupt aggregation values
>>  *             currently there is no use case where we want to configure
>>  *             interrupt aggregation dynamically. So to configure interrupt
>> @@ -342,6 +405,34 @@ static inline void ufshcd_hba_stop(struct ufs_hba *hba)
>>  }
>>
>>  /**
>> + * ufshcd_send_command - Send SCSI or device management commands
>> + * @hba: per adapter instance
>> + * @task_tag: Task tag of the command
>> + */
>> +static inline
>> +void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag)
>> +{
>> +       hba->outstanding_reqs |= (1 << task_tag);
>> +       writel((1 << task_tag),
>> +              (UFSHCD_MMIO_BASE + REG_UTP_TRANSFER_REQ_DOOR_BELL));
>> +}
>> +
>> +/**
>> + * ufshcd_copy_sense_data - Copy sense data in case of check condition
>> + * @lrb - pointer to local reference block
>> + */
>> +static inline void ufshcd_copy_sense_data(struct ufshcd_lrb *lrbp)
>> +{
>> +       int len;
>> +       if (lrbp->sense_buffer != NULL) {
>> +               len = be16_to_cpu(lrbp->ucd_rsp_ptr->sense_data_len);
>> +               memcpy(lrbp->sense_buffer,
>> +                       lrbp->ucd_rsp_ptr->sense_data,
>> +                       min_t(int, len, SCSI_SENSE_BUFFERSIZE));
>> +       }
>> +}
>> +
>> +/**
>>  * ufshcd_hba_capabilities - Read controller capabilities
>>  * @hba: per adapter instance
>>  */
>> @@ -385,6 +476,42 @@ ufshcd_send_uic_command(struct ufs_hba *hba, struct uic_command *uic_cmnd)
>>  }
>>
>>  /**
>> + * ufshcd_map_sg - Map scatter-gather list to prdt
>> + * @lrbp - pointer to local reference block
>> + */
>> +static void ufshcd_map_sg(struct ufshcd_lrb *lrbp)
>> +{
>> +       struct ufshcd_sg_entry *prd_table;
>> +       struct scatterlist *sg;
>> +       struct scsi_cmnd *cmd;
>> +       int sg_segments;
>> +       int i;
>> +
>> +       cmd = lrbp->cmd;
>> +       sg_segments = scsi_dma_map(cmd);
>> +
>> +       BUG_ON(sg_segments < 0);
>> +
>> +       if (sg_segments) {
>> +               lrbp->utr_descriptor_ptr->prd_table_length =
>> +                                       cpu_to_le16((u16) (sg_segments));
>> +
>> +               prd_table = (struct ufshcd_sg_entry *)lrbp->ucd_prdt_ptr;
>> +
>> +               scsi_for_each_sg(cmd, sg, sg_segments, i) {
>> +                       prd_table[i].size  =
>> +                               cpu_to_le32(((u32) sg_dma_len(sg))-1);
>> +                       prd_table[i].base_addr =
>> +                               cpu_to_le32(sg->dma_address);
>> +                       prd_table[i].upper_addr =
>> +                               cpu_to_le32((sg->dma_address >> 32));
>> +               }
>> +       } else {
>> +               lrbp->utr_descriptor_ptr->prd_table_length = 0;
>> +       }
>> +}
>> +
>> +/**
>>  * ufshcd_int_config - enable/disable interrupts
>>  * @hba: per adapter instance
>>  * @option: interrupt option
>> @@ -410,6 +537,124 @@ static void ufshcd_int_config(struct ufs_hba *hba, u32 option)
>>  }
>>
>>  /**
>> + * ufshcd_compose_upiu - form UFS Protocol Information Unit(UPIU)
>> + * @hba: per adapter instance
>> + * @lrb - pointer to local reference block
>> + */
>> +static void ufshcd_compose_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
>> +{
>> +       struct utp_transfer_req_desc *req_desc;
>> +       struct utp_upiu_cmd *ucd_cmd_ptr;
>> +       u32 data_direction;
>> +       u32 upiu_flags;
>> +
>> +       ucd_cmd_ptr = lrbp->ucd_cmd_ptr;
>> +       req_desc = lrbp->utr_descriptor_ptr;
>> +
>> +       memset(ucd_cmd_ptr, 0, sizeof(struct utp_upiu_cmd));
>> +
>> +       switch (lrbp->command_type) {
>> +       case UTP_CMD_TYPE_SCSI:
>> +               if (DMA_FROM_DEVICE == lrbp->cmd->sc_data_direction) {
>> +                       data_direction = UTP_DEVICE_TO_HOST;
>> +                       upiu_flags = UPIU_CMD_FLAGS_READ;
>> +               } else if (DMA_TO_DEVICE == lrbp->cmd->sc_data_direction) {
>> +                       data_direction = UTP_HOST_TO_DEVICE;
>> +                       upiu_flags = UPIU_CMD_FLAGS_WRITE;
>> +               } else {
>> +                       data_direction = UTP_NO_DATA_TRANSFER;
>> +                       upiu_flags = 0;
> I think that we can add some enum value for like UTP_NO_DATA_TRANSFER.

We'll add a comment.

>> +               }
>> +
>> +               /*
>> +                * Transfer request desc header fields
>> +                * set interrupt bit if interrupt aggregation is disabled
>> +                */
>> +               req_desc->header.dword_0 = cpu_to_le32(data_direction |
>> +                                                      UTP_SCSI_COMMAND);
>> +
>> +               /*
>> +                * assigning invalid value for command status. Controller
>> +                * updates OCS on command completion, with the command
>> +                * status
>> +                */
>> +               req_desc->header.dword_2 =
>> +                       cpu_to_le32(OCS_INVALID_COMMAND_STATUS);
>> +
>> +               /* command descriptor fields */
>> +               ucd_cmd_ptr->exp_data_transfer_len =
>> +                       cpu_to_be32(lrbp->cmd->transfersize);
>> +               memcpy(ucd_cmd_ptr->cdb, lrbp->cmd->cmnd,
>> +                     (min_t(unsigned short,
>> +                            lrbp->cmd->cmd_len,
>> +                            (unsigned short)MAX_CDB_SIZE)));
> Is there any reason type casting for MAX_CDB_SIZE ?

No, we'll remove the type casting.

>
>> +
>> +               ucd_cmd_ptr->header.dword_0 =
>> +                       cpu_to_be32(UPIU_HEADER_DWORD(UPIU_TRANSACTION_COMMAND,
>> +                                                     upiu_flags,
>> +                                                     lrbp->lun,
>> +                                                     lrbp->task_tag));
>> +               ucd_cmd_ptr->header.dword_1 =
>> +                       cpu_to_be32(
>> +                               UPIU_HEADER_DWORD(UPIU_COMMAND_SET_TYPE_SCSI,
>> +                                                 0,
>> +                                                 0,
>> +                                                 0));
>> +
>> +               /* set command response to zero */
>> +               memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp));
> Why did you set ucd_rsp_ptr to zero afte adding value ?

We are assigning values to ucd_cmd_ptr(command) and memset is being
done on ucd_rsp_ptr(response).

> And plz add break here.

ok, we'll update it.

>> +       case UTP_CMD_TYPE_DEV_MANAGE:
>> +               /* For query function implementation */
>> +               break;
>> +       case UTP_CMD_TYPE_UFS:
>> +               /* For UFS native command implementation */
>> +               break;
>> +       } /* end of switch, command_type */
>> +}
>> +
>> +/**
>> + * ufshcd_queuecommand - main entry point for SCSI requests
>> + * @cmd: command from SCSI Midlayer
>> + * @done: call back function
>> + *
>> + * Retruns 0 for success, SCSI Midlayer specific error in case of failure
>> + */
>> +static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
>> +{
>> +       struct ufshcd_lrb *lrbp;
>> +       struct ufs_hba *hba;
>> +       unsigned long flags;
>> +       int tag;
>> +
>> +       hba = (struct ufs_hba *) &host->hostdata[0];
>> +
>> +       tag = cmd->request->tag;
>> +
>> +       if (UFSHCD_STATE_OPERATIONAL != hba->ufshcd_state)
>> +               return SCSI_MLQUEUE_HOST_BUSY;
>> +
>> +       lrbp = &hba->lrb[tag];
>> +
>> +       lrbp->cmd = cmd;
>> +       lrbp->sense_bufflen = SCSI_SENSE_BUFFERSIZE;
>> +       lrbp->sense_buffer = cmd->sense_buffer;
>> +       lrbp->task_tag = tag;
>> +       lrbp->lun = cmd->device->lun;
>> +
>> +       lrbp->command_type = UTP_CMD_TYPE_SCSI;
>> +
>> +       /* form UPIU before issuing the command */
>> +       ufshcd_compose_upiu(hba, lrbp);
>> +       ufshcd_map_sg(lrbp);
>> +
>> +       /* issue command to the controller */
>> +       spin_lock_irqsave(host->host_lock, flags);
>> +       ufshcd_send_command(hba, tag);
>> +       spin_unlock_irqrestore(host->host_lock, flags);
>> +       return 0;
>> +}
>> +
>> +/**
>>  * ufshcd_memory_alloc - allocate memory for host memory space data structures
>>  * @hba: per adapter instance
>>  *
>> @@ -680,6 +925,7 @@ static int ufshcd_make_hba_operational(struct ufs_hba *hba)
>>        ufshcd_config_int_aggr(hba, INT_AGGR_CONFIG);
>>
>>        hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
>> +       scsi_scan_host(hba->host);
>>
>>        return 0;
>>  }
>> @@ -763,6 +1009,190 @@ static int ufshcd_initialize_hba(struct ufs_hba *hba)
>>  }
>>
>>  /**
>> + * ufshcd_slave_alloc - handle initial scsi devie configurations
>> + * @sdev: pointer to scsi device
>> + *
>> + * Returns success
>> + */
>> +static int ufshcd_slave_alloc(struct scsi_device *sdev)
>> +{
>> +       struct ufs_hba *hba;
>> +
>> +       hba = (struct ufs_hba *)sdev->host->hostdata;
>> +       sdev->tagged_supported = 1;
>> +       scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
>> +       scsi_activate_tcq(sdev, hba->nutrs);
>> +
>> +       return 0;
>> +}
>> +
>> +/**
>> + * ufshcd_slave_destroy - remove scsi device configurations
>> + * @sdev: pointer to scsi device
>> + */
>> +static void ufshcd_slave_destroy(struct scsi_device *sdev)
>> +{
>> +       struct ufs_hba *hba;
>> +
>> +       hba = (struct ufs_hba *)sdev->host->hostdata;
>> +       scsi_deactivate_tcq(sdev, hba->nutrs);
>> +}
>> +
>> +/**
>> + * ufshcd_scsi_cmd_status - Update SCSI command result based on scsi status
>> + * @lrb: pointer to local reference block of completed command
>> + * @scsi_status: SCSI command status
>> + *
>> + * Returns value base on SCSI command status
>> + */
>> +static inline int
>> +ufshcd_scsi_cmd_status(struct ufshcd_lrb *lrbp, int scsi_status)
>> +{
>> +       int result = 0;
>> +
>> +       switch (scsi_status) {
>> +       case SAM_STAT_GOOD:
>> +               result |= DID_OK << 16 |
>> +                         COMMAND_COMPLETE << 8 |
>> +                         SAM_STAT_GOOD;
>> +               break;
>> +       case SAM_STAT_CHECK_CONDITION:
>> +               result |= DRIVER_SENSE << 24 |
>> +                         COMMAND_COMPLETE << 8 |
>> +                         SAM_STAT_CHECK_CONDITION;
>> +               ufshcd_copy_sense_data(lrbp);
>> +               break;
>> +       case SAM_STAT_BUSY:
>> +               result |= DID_BUS_BUSY << 16 |
>> +                         SAM_STAT_BUSY;
>> +               break;
>> +       case SAM_STAT_TASK_SET_FULL:
>> +               result |= DID_OK << 16 |
>> +                         COMMAND_COMPLETE << 8 |
>> +                         SAM_STAT_TASK_SET_FULL;
>> +               break;
>> +       case SAM_STAT_TASK_ABORTED:
>> +               result |=  DID_ABORT << 16 |
>> +                          ABORT_TASK << 8 |
>> +                          SAM_STAT_TASK_ABORTED;
> plz add break here also.

ok, we'll update it.

>> +       default:
>> +               result |= DID_ERROR << 16;
>> +               break;
>> +       } /* end of switch */
>> +
>> +       return result;
>> +}
>> +
>> +/**
>> + * ufshcd_transfer_rsp_status - Get overall status of the response
>> + * @lrb: pointer to local reference block of completed command
>> + *
>> + * Returns result of the command to notify SCSI midlayer
>> + */
>> +static inline int ufshcd_transfer_rsp_status(struct ufshcd_lrb *lrbp)
>> +{
>> +       int result = 0;
>> +       int scsi_status;
>> +       int ocs;
>> +
>> +       /* overall command status of utrd */
>> +       ocs = ufshcd_get_tr_ocs(lrbp);
>> +
>> +       switch (ocs) {
>> +       case OCS_SUCCESS:
>> +
>> +               /* check if the returned transfer response is valid */
>> +               result = ufshcd_is_valid_req_rsp(lrbp->ucd_rsp_ptr);
>> +               if (result) {
>> +                       pr_err(UFSHCD ":Invalid Response\n");
>> +                       break;
>> +               }
>> +
>> +               /*
>> +                * get the response UPIU result to extract
>> +                * the SCSI command status
>> +                */
>> +               result = ufshcd_get_rsp_upiu_result(lrbp->ucd_rsp_ptr);
>> +
>> +               /*
>> +                * get the result based on SCSI status response
>> +                * to notify the SCSI midlayer of the command status
>> +                */
>> +               scsi_status = result & MASK_SCSI_STATUS;
>> +               result = ufshcd_scsi_cmd_status(lrbp, scsi_status);
>> +               break;
>> +       case OCS_INVALID_CMD_TABLE_ATTR:
>> +               result |= DID_ERROR << 16 | COMMAND_COMPLETE << 8;
>> +               break;
>> +       case OCS_INVALID_PRDT_ATTR:
>> +               result |= DID_ERROR << 16 | COMMAND_COMPLETE << 8;
>> +               break;
>> +       case OCS_MISMATCH_DATA_BUF_SIZE:
>> +               result |= DID_ERROR << 16 | COMMAND_COMPLETE << 8;
>> +               break;
>> +       case OCS_MISMATCH_RESP_UPIU_SIZE:
>> +               result |= DID_ERROR << 16 | COMMAND_COMPLETE << 8;
>> +               break;
>> +       case OCS_PEER_COMM_FAILURE:
>> +               result |= DID_ERROR << 16 | COMMAND_COMPLETE << 8;
>> +               break;
>> +       case OCS_ABORTED:
>> +               result |= DID_ABORT << 16 | ABORT_TASK << 8;
>> +               break;
>> +       case OCS_FATAL_ERROR:
>> +               result |= DID_ERROR << 16 | COMMAND_COMPLETE << 8;
>> +               break;
>> +       default:
>> +               /* should not come here */
>> +               result |= DID_ERROR << 16 | COMMAND_COMPLETE << 8;
>> +               pr_err(UFSHCD ":Invalid OCS from controller\n");
>> +               break;
>> +       } /* end of switch */
>> +
>> +       return result;
>> +}
>> +
>> +/**
>> + * ufshcd_transfer_req_compl - handle SCSI and query command completion
>> + * @hba: per adapter instance
>> + */
>> +static void ufshcd_transfer_req_compl(struct ufs_hba *hba)
>> +{
>> +       struct ufshcd_lrb *lrb;
>> +       u32 completed_reqs;
>> +       u32 tr_doorbell;
>> +       int result;
>> +       int index;
>> +
>> +       lrb = hba->lrb;
>> +       tr_doorbell =
>> +               readl(hba->mmio_base + REG_UTP_TRANSFER_REQ_DOOR_BELL);
>> +       completed_reqs = tr_doorbell ^ hba->outstanding_reqs;
>> +
>> +       /* clear completed commands from outstanding_reqs */
>> +       hba->outstanding_reqs ^= completed_reqs;
>> +
>> +       for (index = 0; index < hba->nutrs; index++) {
>> +               if (completed_reqs & (1 << index)) {
>> +
>> +                       result = ufshcd_transfer_rsp_status(&lrb[index]);
>> +
>> +                       if (NULL != lrb[index].cmd) {
>> +                               scsi_dma_unmap(lrb[index].cmd);
>> +                               lrb[index].cmd->result = result;
>> +                               lrb[index].cmd->scsi_done(lrb[index].cmd);
>> +
>> +                               /* Mark completed command as NULL in LRB */
>> +                               lrb[index].cmd = NULL;
>> +                       }
>> +               } /* end of if */
>> +       } /* end of for */
>> +
>> +       /* Reset interrupt aggregation counters */
>> +       ufshcd_config_int_aggr(hba, INT_AGGR_RESET);
>> +}
>> +
>> +/**
>>  * ufshcd_uic_cc_handler - handle UIC command completion
>>  * @work: pointer to a work queue structure
>>  *
>> @@ -793,6 +1223,9 @@ static void ufshcd_sl_intr(struct ufs_hba *hba, u32 intr_status)
>>  {
>>        if (intr_status & UIC_COMMAND_COMPL)
>>                schedule_work(&hba->uic_workq);
>> +
>> +       if (intr_status & UTP_TRANSFER_REQ_COMPL)
>> +               ufshcd_transfer_req_compl(hba);
>>  }
>>
>>  /**
>> @@ -830,7 +1263,13 @@ static struct scsi_host_template ufshcd_driver_template = {
>>        .module                 = THIS_MODULE,
>>        .name                   = UFSHCD,
>>        .proc_name              = UFSHCD,
>> +       .queuecommand           = ufshcd_queuecommand,
>> +       .slave_alloc            = ufshcd_slave_alloc,
>> +       .slave_destroy          = ufshcd_slave_destroy,
>>        .this_id                = -1,
>> +       .sg_tablesize           = SG_ALL,
>> +       .cmd_per_lun            = UFSHCD_CMD_PER_LUN,
>> +       .can_queue              = UFSHCD_CAN_QUEUE
>>  };
>>
>>  /**
>> @@ -1003,6 +1442,7 @@ ufshcd_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>>        host->max_lun = UFSHCD_MAX_LUNS;
>>        host->max_channel = UFSHCD_MAX_CHANNEL;
>>        host->unique_id = host->host_no;
>> +       host->max_cmd_len = MAX_CDB_SIZE;
>>
>>        /* Initialize work queues */
>>        INIT_WORK(&hba->uic_workq, ufshcd_uic_cc_handler);
>> @@ -1014,6 +1454,13 @@ ufshcd_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>>                goto out_lrb_free;
>>        }
>>
>> +       /* Enable scsi tag mapping */
>> +       err = scsi_init_shared_tag_map(host, host->can_queue);
>> +       if (err) {
>> +               dev_err(&pdev->dev, "init shared queue failed\n");
>> +               goto out_free_irq;
>> +       }
>> +
>>        pci_set_drvdata(pdev, hba);
>>
>>        err = scsi_add_host(host, &pdev->dev);
>> --
>> 1.7.5.4
>>
>> --
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Thanks,
~Santosh
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